Pneumatic tire.



No. 811,109. PATENTED JAN. 30, 1906. F. VEITH.

PNEUMATIG TIRE.

APPLIOATION FILED APILZS, 1905.

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PNEUIltVlAlG 'l'IIHEIII Specification of Letters Patent.

Application filed April 29, 1905. Serial No. 257,971.

To a/ZZ whom it may conce/rma Be it known that I, FRIEDRICH VEITH, a subject of'the Grand Duke of Hesse, and a resident of Hchst-in-the-Odenwald, in the Grand Duchy of Hesse, Germany, have invented certain new and useful Improvements inlneumatic Tires, of which the following is a specification.

My invention relates to improvements in pneumatic tires whereby the danger of dam aging the tire with tools during its application to the wheel-rim, and also the danger of pinching the tire in the rim-recesses are avoided.

The objects of my improvement are, first, to make the cover of a cross-section in the shape of a horseshoe and to provide its inner edges with flanges, and, second, to provide 'an india-rubber tube of a circular cross-sec tion, an inner portion of which projects out- I, wardly into its cavity, so that on inflating the \tube this inner portion will project inwardly. I attain these objects by the construction illustrated in the accompanying drawings, in whichm Figure 1 is a cross-section through a pneumatic tire and a wheel-rim, the india-rubber tube being in its natural state; and FigQ is a similar cross-section in which the india-rubber tube is inflated.

As is Well known the india-rubber tube of known pneumatic tires is very apt to get damaged by the tools on being inserted in its cas ingr or cover and on the pneumatic tire being applied to the rim. Thedeiects of the indiarubber tube so produced give occasion to frequent complaints and inconveniences. The chief cause for such defects lies in the fact that the external diameter of the not-inflated indiarubber tube is almost equal to the internal diameter of the casingor cover, so that in using the tools it is almost impossible to avoid any touch between their points and the internal tube.

My improved pneumatic tire consists of a cover A of a cross-section in the shape of a horseshoe and an india-rubber tube B. The inner edges ofthe cover A are rovided with iianges 11, which are adapted) to enga e in corres onding recesses 2 2l of the whee rim C, an the shoulders 3 3 ofthe cover A are ar.- ranged to rest on the conical -faces of the rim C, as is clearly shown in both ures. The india-rubber tube B is so forme that in its natural state (shown at Fig. 1) its internal portlon 5 projects outwardly into its cavity.

Otherwise the tube B fairlyiits to the internal faces of the cover A, so that it can be readily inserted in the cover A. When applying the pneumatic tire in the usual manner to the` wheel-rim C with the aid of tools, the latter acting upon the flanges 1 1 or upon the shoulders 3 3 are not likely to come in contact with the inner portion 5 of the internal tube B, so that the latter remains intact. Thus the application of the pneumaticotire to the wheelrim C can be effected with perfect safety. On inating the internal tube Bin the usual manner its inner portion 5 will yield to the pressure of the compressed air and project inwardly, as is clearly shown at Fig. 2. The wheel-rim C maybe provided with one or several fine holes for the escaping air which previously filled up the space 6 between the rim C, the inner portion 5, and parts of the'cover A, so as to enable the inner portion 5to completely bear against the rim C. Where so preferred, of course the iine holes in the` rim C may be omitted, in which case the air within the space 6 will be simply compressed and form a pad, the space 6 being o course reduced. In both cases the two flanges 1 1 of the cover A will be pressed into the` recesses 2 2 of the rim C, and thereby secured. When the compressed air is permitted to escape from the internal tube B, the elasticity of the inner portion 5 will return the latter into its initial position. (Shown at Fig. l.) This will be clear when taking into consideration that the inner portionA 5 in its natural state has a larger diameter, so that on inflatinv the tube B this portion 5 will be compressed for attaining the smaller diameter. that no pinching of the internal tube B between the rim C and the flan es 1 1 of the cover A can take place during t e application of the pneumatic tire to the wheel-rim. The peculiar shape of the cross-section of the internal tube B also greatly facilitates the manufacture of this tube with the aid of molds,

It is evident Patented Jan. so, 190e. l

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since every pinching ofthe tube in the closed v mold, consisting of several parts previous to IOS IIO

2. 'In a pneumatic tire, the combination Y with a wheel-rim having two opposite annular recesses, of a cover of a cross-section in the shape of a horseshoe, the inner edges of which are provided with two ianges for engaging in the annular recesses of said wheel-rim, and an india-rubber tube, of which an inner porv tion normallyprojects outwardly into its cavity, so that on inating the tube this inner portion will project inwardly and ill up the space between said wheel-rim and the lianges of said cover.

3. In a pneumatic tire, the combination with a wheel-rim/having two diverging conical portions and two opposite annular recesses behind them, of a cover of a cross-section in the shape of a horseshoe and having two shoulders and two flanges on its inner the space between said wheel-rim andthe -flanges of said cover.

In testimony whereof l have hereunto set my handin the presence of two subscribing witnesses.

FRIEDRICH VEITH.

Witnesses:

EDWARD ROUGE, JEAN' GRUND. 

